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Loans and Allowance for Loan Losses - Impaired loans (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Impaired    
Loans with related allowance for loan losses, Recorded investment $ 625 $ 4,717
Loans with related allowance for loan losses, unpaid principal 667 4,746
Loans with related allowance for loan losses, Related Allowance 283 1,205
Loans with no related allowance for loan losses, Recorded investment 2,127 3,813
Loans with no related allowance for loan losses, unpaid principal 2,403 4,358
Recorded investment 2,752 8,530
Unpaid principal balance 3,070 9,104
Commercial | Commercial and industrial    
Impaired    
Loans with related allowance for loan losses, Recorded investment 445 723
Loans with related allowance for loan losses, unpaid principal 464 725
Loans with related allowance for loan losses, Related Allowance 278 336
Loans with no related allowance for loan losses, Recorded investment 1,386 1,893
Loans with no related allowance for loan losses, unpaid principal 1,575 2,173
Recorded investment 1,831 2,616
Unpaid principal balance 2,039 2,898
Commercial | Commercial real estate    
Impaired    
Loans with related allowance for loan losses, Recorded investment 180 3,948
Loans with related allowance for loan losses, unpaid principal 203 3,974
Loans with related allowance for loan losses, Related Allowance 5 837
Loans with no related allowance for loan losses, Recorded investment 629 1,276
Loans with no related allowance for loan losses, unpaid principal 684 1,415
Recorded investment 809 5,224
Unpaid principal balance 887 5,389
Consumer | Residential | Real estate first mortgage    
Impaired    
Loans with no related allowance for loan losses, Recorded investment 21 439
Loans with no related allowance for loan losses, unpaid principal 24 464
Recorded investment 21 439
Unpaid principal balance 24 464
Consumer | Residential | Real estate junior lien    
Impaired    
Loans with related allowance for loan losses, Recorded investment   19
Loans with related allowance for loan losses, unpaid principal   20
Loans with related allowance for loan losses, Related Allowance   19
Loans with no related allowance for loan losses, Recorded investment 91 205
Loans with no related allowance for loan losses, unpaid principal 120 306
Recorded investment 91 224
Unpaid principal balance $ 120 326
Consumer | Other revolving and installment    
Impaired    
Loans with related allowance for loan losses, Recorded investment   27
Loans with related allowance for loan losses, unpaid principal   27
Loans with related allowance for loan losses, Related Allowance   13
Recorded investment   27
Unpaid principal balance   $ 27